#region license

// Copyright (c) 2008, Rinat Abdullin (http://rabdullin.com)
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
// 
//     * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
//     * Neither the name of the Rinat Abdullin nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#endregion

using System;
using System.Collections.Generic;
using System.Container;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.CompilerServices;
using Boo.Lang.Compiler;
using Boo.Lang.Compiler.IO;
using Boo.Lang.Compiler.MetaProgramming;
using Boo.Lang.Compiler.Pipelines;
using Boo.Lang.Compiler.Steps;

namespace Photon.Interception
{
	/// <summary>
	/// This class is responsible for generating Decorators out of the source code
	/// </summary>
	public sealed class DecoratorGenerator
	{
		private readonly List<ICompilerInput> _inputs = new List<ICompilerInput>();
		private readonly List<Assembly> _references = new List<Assembly>();

		/// <summary>
		/// Creates new instance of the <see cref="DecoratorGenerator"/>
		/// </summary>
		public DecoratorGenerator()
		{
			_references.Add(typeof (Framework).Assembly);
			_references.Add(typeof (ExtensionAttribute).Assembly);
		}

		/// <summary>
		/// Adds new source file
		/// </summary>
		/// <param name="file"></param>
		public void AddSource(FileInfo file)
		{
			_inputs.Add(new FileInput(file.FullName));
		}

		/// <summary>
		/// Compiles everything to memory and returns the decorators
		/// </summary>
		/// <returns></returns>
		public IEnumerable<DecoratorInfo> CompileAll()
		{
			var parameters = new CompilerParameters
			{
				Pipeline = new CompileToMemory(),
				OutputType = CompilerOutputType.Library
			};

			parameters.References.Extend(_references);

			parameters.References.Add(typeof(HandleMacro).Assembly);
			parameters.Pipeline.Insert(1, new Interception());
			parameters.Pipeline.InsertAfter(typeof (ProcessInheritedAbstractMembers), new FixStubs());

			foreach (var input in _inputs)
			{
				parameters.Input.Add(input);
			}

			var compiler = new BooCompiler(parameters);


			var run = compiler.Run();

			if (run.Errors.Count > 0)
			{
				throw new CompilationErrorsException(run.Errors);
			}
			var assembly = run.GeneratedAssembly;

			var types = assembly.GetTypes().MarkedWith<DecoratorAttribute>(false);

			return types.Select(t => new DecoratorInfo(t, t.GetAttribute<DecoratorAttribute>(false).Service));
		}

		/// <summary>
		/// Adds the <see cref="Assembly"/> reference
		/// </summary>
		/// <param name="assembly"></param>
		public void AddReference(Assembly assembly)
		{
			_references.Add(assembly);
		}
	}
}